INDEX 
Chromosome, mechanism, 57, 59, 61, 65, 105 
number and breeding, 342 
and selection, 257 
and specification, 263 
in horse and ass, 519, 537 
relations in sex-inheritance, 196, 205 
theory of heredity and linkage, 104, 117 
Chromosomes, 57, 58, 59 
aggregates of chromatic material, 59 
and fertility, 555 
behavior in non-disjunction, 199 
combinations of, in germ cells, 64, 65 
deviations in number, 263 
diploid and haploid numbers, 65, 66 
independent distribution of, 63 
individuality of, 59 
in graft-hybrids, 374 
in male and female honey bees, 210 
in related forms, 264 
interchange of chromatin between, 63, 65, 67 
maternal and paternal, 60, 64, 65 
number in Abraxas, 208 
in Drosophila, maize, 
tobacco, 57, 184 
in Nicotiana, 184 
in wheat and rye, 238 
occurrence in pairs, 58 
phylogeny of, 264 
Chrysanthemum, bud sports in, 398 
collections, 299 
species and varieties, 302 
Citrous fruits, chimeras, 381 
bud selection, 391 
undesirable sports, 391 
Citrullus vulgaris, 414 
Citrus breeding, 297, 300 
bud mutations in, 392 
chimeras, 375, 378, 381 
collection, 300 
group, research on, 300 
pollen, 300 
Clark, Ghirka wheat, 372 
Classifications of variations, 15 
Clonal diversity, 302 
multiplication, 296, 311 
selection, 291, 293 
selections, propagation, 298 
variation, 391 
Clone, 257 
propagation of, 298 
Close-pollinated plants, selection in, 336 
Clover, at Svaléf, 293 
red, 317 
remnant system, 335 
Club wings in Drosophila, 134, 135 
Cockerell, red sunflower, 270 
Coefficient of correlation, 52 
as index of inheritance, 459 
calculation of, 53 
interpretation of, 54 
of inbreeding, 598 
of relationship, 600 
of variability, 44 
in F; families, 185 
wheat, man and 
Coffee, dimorphic branches, 275 
Coit, Bizarria, 378 
orange chimeras, 375 
“‘recorded”’ stock, 394 
undesirable sports, 391 
Washington navel orange, 392 
Cole, Clydesdale, 467 
record sheet, 603, 605 
reversion in pigeons, 172 
Coleus, blumei, 389 
bud mutations, 388, 390 
selection in, 386, 389, 390 
sports, 386 
color patterns, 387 
composite crossing in, 386 
fluctuating variation, 386, 390 
history of garden, 386, 389 
lacinate-leaved, 386, 389 
pedigree method, 390 
pigmentation, 389 
seed progeny, 389 
somatic factor mutations, 388 
Collections of plant-breeding material, 299 
Collings, breeder, 501 
Collins, comparing yields, 356, 357 
corn, purple X white, 105, 358 
increase in yield by hybrids, 354, 359 
narrow breeding, 334 
seed corn production, 361 
Collins and Kempton, effects of crossing, 360, 361 
Color-blindness in man, 197 
-chimeras, 381 
Comb characters in fowls, 164 
Combinations, 15, 99 
of factors in crossing-over, 108 
of gametes in Mendelian experiments, 100 
sesqui-hybrid, 235, 237, 244, 248 
Commelin, sweet pea, 303 
Cook, cotton, 295 
dimorphic branches and leaves, 275, 276 
“‘new creations,’’ 440, 441 
Cooper, plant breeding, 437 
selection, value of, 288 
Complementary factors, 140 
Composite crossing, fruits and flowers, 297 
grains, 296 
in Coleus, 386 
roses, 311 
Composition of plant populations, 317, 321 
of self-fertilized populations, 320 
Concept of factor mutation, 267 
of reaction system relations, 238, 242, 248 
Contabescence, factor for, in sweet peas, 234 
Contagious abortion in cattle, 552 
Contamination, allelomorphic, assumed, 192 
of factor, hypothesis of, 190 
Continuous variations, 18 
Codéperative breeding, 606 
Corbett, seed impurity, 428 
Corn, see Maize. 
Correlation, 49 
and linkage, 127 
and modifiability, 459 
and selection, 49, 506 
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